Perpetual calendar



12 A. L. CURTIS PERPETUAL CALENDAR Filed Jan. 16 1925 Patented July 12, 1927.

UNITED STATES 1,635,927 PATENT-OFFICE.

ARTHUR L. CURTIS, OF CHICAGO, ILLINOIS.

PERPETUAL CALENDAR.

Application filed January 16, 1925. Serial No. 2,725.

month of any year. This type of calendar 7 thus affords a ready reference device which does not require the use of any lengthy year tables or any involved complication in determining the day of the week or month.

Various specific objects which my invention. attains will be set forth at length in the accompanying description of a preferred embodiment of the invention.

In the drawings accompanying this dc scription:

Figure 1 is a front elevational view of another modification employing changeable blocks;

Figure 2 is a vertical sectional view through the same;

Figure 3 is a front elevational view of the removable slide which carries the indicating blocks; a

Figure t is a front elevational view of the bottom closing block;

Figure 5 is an end eleva'tional view of the same;

Figure 6 is a view illustrating the relative I grouping of the several blocks, but with the blocks slightly separated for clarity of illustration; and

Figure 7 is a similar view in perspective showing the relative relation between the year, month and day blocks.

In the embodiment shown in Figures 1 to 7, inclusive, the casing 7 5 comprises front and back plates 76 and 77 which are joined by bottom and side spacers 78 and 79, these spacers leaving a rectangular recess 81 open at the top of the casing 75. A slide 82for carrying the changeable indicia is receivable in this recess 81. This slide comprises an upper cross member 83, adapted to close the top of the recess 81, and a narrower body portion 84: depending from the upper-cross member. This body portion has a recessed area'85 in its front face of rectangular outline for receiving indicating blocks which are displayed through an opening 86 in the front plate 76. v

' The upper end of the recess 85 is adapted to receive three horizontally extending blocks 87. When properly assembled in the upper part of the recess, onlv the front face of the lowermost block is visible through the opem ing 86, as will be evident from Figure 9. The four sides of each block have different months printed thereon, and by the provision ofthree of these blocks the twelve calendar months are available on these blocks; 7

If it should be desired to have a changeable year indication, the blocks 87 are made sufficiently short to accommodate cubes 88 at both ends. The six sides of each cube have different years printed thereon, and

by the provision of three of these cubes at each end, this year indicating means has year indicating numerals thereon extending over a wide period of years,

After the month and year indicating members have been inserted in the upper partof the recess 85 (with the desired month and year showing on the front faces of the lower block 87 and cubes 88), the next member to be inserted is a cross bar 89 on which are printed the day-of-the-week abbreviations 27. The under side of this cross bar 89 has a slot 91 extending longitudinally thereof for receiving pegs or pin ends 92 on the upper ends of the day indicating blocks 93. These latter-blocks are adapted to lie vertically in the recess 85 and are also of four sided square section for affording four indicating faces. Extending down each of these indicating faces is a verical column 52' which is ruled off horizontally to define the horizontal rows by rulings 55. As described above, successive numbers in each of these columns will differ by 7. The four sides of the seven blocks 93 give twenty eight columns which may be brought into Y indicating position in the opening-86 in different combinations. I prefer thateach block have the same combination of numerals; For example, the block shown in Figure 14 has the numerals 3, 10, 17, 241 and 31, this combination of numerals being offset one space on different sides of the block.

Thus, by turning the block the upper numeral 3 may be made to fall in the first week of the month or in the second week. The two other sides of the block, not visible in this figure, can have these same combinations of numerals ending at 24, however, whereby one or the other of these latter sides may be presented to the opening 86 for months of less than thirty-one days.

After the proper combination of day numerals has been set 11 in the blocks 93, the latter are inserted in t e recess 85 and moved upwardly to place the upper pins 92 in the locking recess 91. In such placing (it the blocks, a lower locking block 95 is placed across the lower ends of the blocks 93 this locking block having a similar longitudinal recess 96 for receiving the pin ends 97 on the lower ends of the blocks 93. This lower locking block has studs or pins 98 project ing from its ends which are receivable in openings 99 cut in the side members of the slide 82. It also has short pegs 100 projecting from the rear side thereof wh ch are adapted to be received in sockets 101 in the back wall of the recess 85. This back *all of the recess 85 is notched out as indicated at 102, whereby the locking block can be readily grasped for withdrawing the same laterally in order to release it from its locked position atthe bottom of the recess 85. After the several. indicating blocks have been properly set and assembled in locked relation in the slide 82, the slide is inserted into the casing 75, as shown in Figures 8 and 9. The laterally projecting ends of the upper cross member 83 of theslidc atl'ord members which can be readily grasped in insere' and removing the slide.

I do not intend to be limited to the par ticular details herein shown and descr bed, except as they are defined in the appended claims.

V I claim: a

1. In a perpetual calendar, a casing:having; a display opening therein, a frame member releasably supported by said casing said frame member having a recess therein, a

different sides to the front of said frame member, whereby to expose said front sides through said display opening.

2. In a perpetual calendar, the combine tion of a casing having a display opening therein, a traine inen'iber reniovably sup ported by said casing, said frame member having a recess therein, three month indicating blocks adapted to be disposed horizontally in the upper part of said recess, year indicating tubes associated with the ends of said month indicating blocks", a plurality of day indicating blocks adapted to be disposed vertically in the lower portion of said recess, a spacing block between said month indicating blocks and said day indieating blocks, said spacing block having a longitudinal recess therein for receiving projections on the upper ends of said day indicatina blocks, day-of-the-weel: characters on said spacing block, a locking block hava recess therein for receiving projections on the lower ends of said day indicating blocks, and means for locking said locking block in said frame member. i

In witness whereof, I hereunto subscribe my name this 30th day of December, 1924;. ARTHUR L. URTIS. 

